Process for the production of pure 3,3',4,4'-tetraamino-biphenyl
    1.
    发明授权
    Process for the production of pure 3,3',4,4'-tetraamino-biphenyl 失效
    制备3,3',4,4'-四氨基苯乙烯的方法

    公开(公告)号:US5235105A

    公开(公告)日:1993-08-10

    申请号:US910653

    申请日:1992-07-08

    申请人: Edgar Vorwerk

    发明人: Edgar Vorwerk

    CPC分类号: C07C209/84

    摘要: The present invention relates to a process for the preparation of pure 3,3',4,4'-tetraaminobiphenyl in high yield by ammonolysis of 3,3,-dichlorobenzidine in the presence of copper powder and CuCl. After the crude product has been washed with ammonia water and water, the 3,3',4,4'-tetraaminobiphenyl, thus pretreated, is crystallized in water in the presence of 0 to 5% by weight of activated carbon and of about 1 to 2% by weight of a water-soluble reducing agent at temperatures of about 100.degree. to about 140.degree. C., under a protective gas atmosphere (redissolution). The water-soluble reducing agent is an alkali metal dithionite or alkali metal sulfite. The protective gas used can be nitrogen. The water used in the recrystallization (redissolution water) can be reused in whole or in part in the recrystallization.

    摘要翻译: 本发明涉及一种在铜粉和CuCl存在下通过3,3,3-三氯联苯胺的氨解,高产率制备纯的3,3',4,4'-四氨基联苯的方法。 在粗产物用氨水和水洗涤后,由此预处理的3,3',4,4'-四氨基联苯在0至5重量%的活性炭和约1重量%的存在下在水中结晶 至约2重量%的水溶性还原剂,在约100至约140℃的温度下,在保护气体气氛(再溶解)下进行。 水溶性还原剂是碱金属连二亚硫酸盐或碱金属亚硫酸盐。 使用的保护气体可以是氮气。 再结晶中使用的水(再溶解水)可以全部或部分重新使用。

    Curing component for synthetic resins, curable mixtures containing the
same, and the use thereof
    2.
    发明授权
    Curing component for synthetic resins, curable mixtures containing the same, and the use thereof 失效
    用于合成树脂的固化组分,含有其的可固化混合物及其用途

    公开(公告)号:US4847346A

    公开(公告)日:1989-07-11

    申请号:US223449

    申请日:1988-07-22

    摘要: Curing component (A) based on polyisocyanates for binders (B) which contain groups containing active hydrogen, wherein the curing component (A) is a product of the reaction of (a1) polyisocyanates with (a2) .alpha.-hydroxyalkylpyridines.Mixtures of (A) and (B), and also, if appropriate, diluents (C) and additives (D), are stable on storage and give, even at temperatures of 120.degree.-140.degree. C., curing products which are sufficiently solvent-stable. They are suitable, in particular, for surface-coating preparations.

    摘要翻译: 基于含有含活性氢基团的粘合剂(B)的聚异氰酸酯的固化组分(A),其中固化组分(A)是(a1)多异氰酸酯与(a2)α-羟基烷基吡啶的反应的产物。 (A)和(B)的混合物,以及适当的稀释剂(C)和添加剂(D)的混合物在储存时是稳定的,即使在120-140℃的温度下也可以得到足够的固化产物 溶剂稳定。 它们特别适用于表面涂层制剂。

    Process for the preparation of 4,4'-dihydroxydiphenyl ether
    3.
    发明授权
    Process for the preparation of 4,4'-dihydroxydiphenyl ether 失效
    制备4,4'-二羟基二苯醚的方法

    公开(公告)号:US4675457A

    公开(公告)日:1987-06-23

    申请号:US906995

    申请日:1986-09-12

    申请人: Edgar Vorwerk

    发明人: Edgar Vorwerk

    摘要: The invention relates to a process for the preparation of 4,4'-dihydroxydiphenyl ether by dehydration of hydroquinone using sulfonic acids or sulfuric acid as catalysts at elevated temperatures. The dehydration product is stirred with an excess of water at 80.degree. to 110.degree. C. The higher condensed byproducts which are undissolved during this are separated off, and the ether desired is allowed to crystallize out of the filtrate obtained.

    摘要翻译: 本发明涉及通过在高温下使用磺酸或硫酸作为催化剂脱氢氢醌来制备4,4'-二羟基二苯醚的方法。 脱水产物在80-110℃下用过量的水搅拌。分离出未溶解的较高浓缩副产物,所需的乙醚从得到的滤液中结晶出来。